THE Senseca HD 48 and HD 49 passive or active transmitters that measure temperature, relative humidity and dew point temperature are some of our leading sellers in South Africa due to their cost effectiveness, high-accuracy measurement and reliability, says Jan Grobler, managing director, Senseca South Africa.
“Both series of transmitters are designed for temperature and humidity control in conditioning and ventilation applications (HVAC/BEMS) across sectors such as blow-drying plants, industrial and specialised processing plants, pharmaceutical facilities, museums, clean rooms, ventilation ducts, industrial and civil sectors, greenhouses, auditoria and high-density farms. They offer a factory-calibrated transmitter, making no further adjustments necessary” says Grobler.
HD48 Transmitter
The HD48 Series transmitter is an active transmitter and accepts both direct and 24V ac alternating power supplies. They have a standard (4-20 mA) or voltage (0 – 10V) outputs or a serial RS485 output. It has screw-type terminal block electrical connections, a standard PBT and 10 µm stainless steel grid protection (P8) and a TV probe working temperature of between -20 °C – + 80 °C. Its electronic protection class is IP66.
Various accessories are available including ones that attach the probe to a duct. The transmitters can be utilised with the HD9008.31 flange, a 3/8th inch universal biconical connection or a PG16 metal cable gland. Its 4-digit optional display shows the measured parameters in a continual or sequential mode.
HD 49 Transmitter
The HD49 Series transmitter is a passive transmitter for insertion in a 4 – 20 mA current loop. The HD49 has a 12 – 40 V dc electrical connection. It has a stainless steel 10 µm filter to protect the sensor against dust and particles and is also classified as electronic protection class IP66.
Various HD 49 models include a horizontal probe for duct mounting (TO); a vertical probe for wall mounting (TV); a probe with 2 or 5 m cable (TC); and a fixed contact Pt100 probe for solar panel (TFP).
For the TO and TC versions, two probe temperature ranges are possible: standard -20 – +80 °C and extended -40 – 150 °C. The temperature range of the thin film 1/3 DIN Pt100 probe for solar panel is -40 – +85 °C.
